If you had a condom break during intercourse, that is one of the risks. The risks for transmission of HIV are unprotected vaginal or anal sex or sharing IV drug needles. HOWEVER, it is a very LOW risk. Less than 1 percent chance of transmission with a one time condom break. Symptoms are NOT how HIV is diagnosed. You should take a 4th generation DUO test at 28 days or beyond. If it has been three weeks, it is close to the time you can test for a conclusive result. Expect it to be negative though.